Albert schmid



(No Model.)

A. SCHMID. ARMATURE FOR ELECTRIC MACHINES.

No. 406,777. Patented July 9, 1889.

WITNESSES: INVENTOR,

finm/n ALBEHT-EBHMID. I

' .i ralguwvwb +1 UNITED STATES PATENT OFFICE.

ALBERT SCHMID, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO THE \VEST-INGHOUSE ELECTRIC COMPANY, OF SAME PLACE.

ARMATURE FOR ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 406,777, dated July 9,1889.

(No model.)

To all whom it may concern.-

Be it known that I, ALBERT SGHMID, a citizen of the Republic ofSwitzerland, residing in the city of Pittsburg, in the county ofAllegheny and State of Pennsylvania, have invented certain new anduseful Improvements in Armatures for Electric Machines, (Case No. 274,)of which the following is a specification.

My invention relates to the construction of IO armatures of electricgenerators and motors.

The special object of the invention is to provide means for preventingthe armature from unduly heating, causing it to remain at acomparatively low temperature.

[ 5 The invention consists in building up the core of plates throughwhich holes or open ings are formed for allowing the circulation of airthrough the interior of the armature, certain of the plat-es havingopenings of different diameter, size, or shape from those of the otherlaminae. The plates'having different sizes may either alternate witheach other in position, or groups of one pattern may alternate withgroups of another pattern, so that the radiating-surface within thearmature is greatly increased.

In the accompanying drawings, Figure l is a transverse section of anarmature-core embodying the features of the invention, and Figs. 2 and 3show two different patterns of the armature-plates. Fig. at shows thetwo plates placed against each other.

Referring to the figures, A represents an armature-shaft, and B 13 endplates for the armature core. Between these two plates laminze ofmagnetizable materialsuch, for instance, as soft iron 0 c are firmlybound together to form the armature-core. These plates may be separatedfrom each other by insulating material. The plates are formed withopenings which are placed opposite each other, so that resultant holeswill extend throughout the length of the armature. For the purpose ofincreasing the radiating-surface formed within such openings, certainplates are made to project a greater distance into the openings thanothers. To accomplish this, certain of the plates are formed with largeropenings or openings of different shapes from the others. Thus in Fig. 2there is shown a plate having eight radial openings c, of a certain sizeand shape, and in Fig. 3 another plate is shown, which is to be used inthe same armature, having in this instance the same number of openings,but larger. These plates may be placed alternately, or a group of anyrequired number of one pattern maybe placed together, and then a groupof the other pattern. This latter arrangement is usually preferred forthe reason that it allows a wider space to intervene between thesurfaces which project within the longitudinal openings of the armature.These surfaces together afford a large radiating-surface, with which theair which circulates through the armature when it is revolving isallowed to come in contact, thus causing the armature to remain muchcooler than would otherwise be the case.

In Fig. two plates are shown as placed against each other, and it willbe noticed that the inner ends of the radial openings correspondapproximately in size and shape, while the greatest difference of sizeand shape is obtained at the outer edges of the openingsthat is to say,the portions which move at the greatest rapidity when the armature isrevolving. It is evident that other patterns of openings than thoseherein shown may be employed, if desired; but those here described willbe sufficient to disclose my invention.

I claim as my invention- 1. An armature for electric machines, composedof laminae of magnetizable material having openings, the openingsthrough certain of said laminae being of different shape from those ofother of the laminae.

2. An armature for electric machines, consisting of plates or laminze ofmagnetizable material laid with their faces adjacent to each other, saidlaminze having openings, the openings of certain of the platescorresponding with each other in size and position,while the metal ofthe other plates projects a greater or less distance into thelongitudinal openings left by the first-named laminae.

3. An armature for electric machines, composed of laminae ofmagnetizable material, having longitudinal openings extending from i llend to end, certain of the laminzo projecting In testimony whereof Ihave hereunto suhinto said longitudinal openings. scribed my name this20th day of l')eoeml)er,

4. An armature for electric machines, com A. l). 1888.

sisting of plates of magnetizable material 5 stamped With openings andarranged in ALBERT SCII'AIID.

groups, and of alternate groups of plates stamped with openings of adifferent size or \Vitnosses: shape, the openings in the several groupsof \V. l)' UPTEORAFF, plates forming together continuous openin CHARLESA. TERRY.

10 through the armature.

